<!DOCTYPE HTML>
<html lang="en-US">

<head>
  <meta charset="UTF-8">
  <title>利用 clipboardData 在网页中实现截屏粘贴的功能</title>
  <style type="text/css">
    #box {
      width: 200px;
      height: 200px;
      border: 1px solid #ddd;
    }
  </style>
</head>

<body>

  <h1>利用 clipboardData 在网页中实现截屏粘贴的功能</h1>  
  <hr />
  <div><input type="text" id="testInput" placeholder="截屏后粘贴到输入框中" size="30" /></div>
  <script type="text/javascript">
    (function () {
      var imgReader = function (item) {
        var blob = item.getAsFile(),
          reader = new FileReader();

        reader.onload = function (e) {
          var img = new Image();

          img.src = e.target.result;
          document.body.appendChild(img);
        };

        reader.readAsDataURL(blob);
      };
      document.getElementById('testInput').addEventListener('paste', function (e) {
        var clipboardData = e.clipboardData,
          i = 0,
          items, item, types;

        if (clipboardData) {
          items = clipboardData.items;

          if (!items) {
            return;
          }

          item = items[0];
          types = clipboardData.types || [];

          for (; i < types.length; i++) {
            if (types[i] === 'Files') {
              item = items[i];
              break;
            }
          }

          if (item && item.kind === 'file' && item.type.match(/^image\//i)) {
            imgReader(item);
          }
        }
      });
    })();
  </script>

</body>

</html>